基于信噪比方法的天地波混合體制雷達一階回波譜提取

doi:10.11999/JEIT150079

基于信噪比方法的天地波混合體制雷達一階回波譜提取

doi: 10.11999/JEIT150079

基金項目:

國家自然科學基金(61032011)和海洋公益性科研專項項目(201505002)

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出版歷程
- 收稿日期: 2015-01-14
- 修回日期: 2015-04-08
- 刊出日期: 2015-09-19

First-order Sea Clutter Spectrum Extraction Based on SNR Method for HF Hybrid Sky-surface Wave Radar

摘要

摘要: 天地波混合體制高頻雷達(簡稱天地波雷達，HFHSSWR)海面一階譜的頻移和展寬特性，使得其一階譜的提取比高頻地波雷達(HFSWR)更困難。該文研究了天地波雷達一階譜頻移和展寬特性，并基于其在2維距離-多普勒譜上連續(xù)分布的特點，將信噪比方法應(yīng)用于天地波雷達一階譜提取。通過雙基地角、電離層和海流等對一階譜頻移及展寬特性的定量分析，確定了信噪比方法中一階譜中心位置、譜峰寬度、左右一階譜間距等參數(shù)的計算方法和取值范圍。并利用2維信噪比方法，解決由于天地波雷達信噪比下降引起的一階譜邊界檢測不精確的問題。最后，將信噪比法分別應(yīng)用于仿真和實測天地波雷達數(shù)據(jù)，驗證了方法的有效性。
- 天地波混合體制雷達 /
- 海面一階譜 /
- 信噪比方法
Abstract: The characteristics of frequency shift and broadening of first-order sea clutter for High Frequency Hybrid Sky-Surface Wave Radar (HFHSSWR) make it harder to isolate the first-order sea clutter spectrum than that of High Frequency Surface Wave Radar (HFSWR). In this paper, the characteristics of first-order sea clutter for HFHSSWR are investigated, and based on its continuously distribution character on the range-Doppler spectrum, the Signal-to-Noise Ratio (SNR) method is used to isolate the first-order sea clutter spectrum for HFHSSWR. From the quantitative analysis of the frequency shift and broadening of the first-order clutter spectrum caused by the bistatic angle, the ionospheres conditions and the ocean current, the estimation method and the value ranges of three parameters are given, which are the center location, the width of first-order sea clutter spectrum and the spacing of the two first-order sea clutter peak. 2-D SNR method is used to solve the problem that the first-order spectrum boundary can not be determined accurately because of the low SNR. Finally, the proposed method is applied to both the simulated and the field data to verify its validity.
- High Frequency Hybrid Sky-Surface Wave Radar (HFHSSWR) /
- First-order sea clutter spectrum /
- Signal-to-Noise Ratio (SNR) method

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參考文獻(22)

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